edit: I like our current legal system, but I know Europe has the (Roman/Napoleonic?) inquisitorial system, if any Europeans could contribute and note if that has different outcomes? Or just any wild ideas on how to tweak the system to give more equal footing that isn't based on money.
Even with a simplified laws and legal proceedings, obviously not everyone would be in a position to defend themselves. However, many of those people could probably find a legally astute relative or friend to help them. There will always be a need for public defenders or something similar, though, since not everyone has a good support network.
To be honest though, I think the only really long term solution is for radical reform to the economy in general is the abolishment of private property. Private property, including intellectual property in particular, is always going to give disproportionate power to the wealthy. We should reward people for actual labor (not necessarily the same amount for the same hours), not because they already have giant stacks of cash.
Parts of the UK and several EU countries have a similar system with a small claims court for copyright cases under a certain limit with a limited discovery, where attorneys are not needed in addition to the regular courts.
Could be done, not sure if it would be a better system...
About your question: you might like this paper https://digitalcommons.law.yale.edu/cgi/viewcontent.cgi?arti...
It doesn't offer any answers, and it's about criminal justice; but it's good food for thought about unintended consequences.
See also the excellent http://www.daviddfriedman.com/Legal%20Systems/LegalSystemsCo... as parodied in https://slatestarcodex.com/2020/03/30/legal-systems-very-dif... and reviewed in https://slatestarcodex.com/2017/11/13/book-review-legal-syst...